import java.math.BigDecimal;
import java.util.Scanner;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 86183
 * Date: 2023-04-05
 * Time: 15:21
 */
public class test13 {
    public static void main(String[] args) {
        Scanner  scanner = new Scanner(System.in);
        while (scanner.hasNext()){
            BigDecimal a = scanner.nextBigDecimal();
            BigDecimal b = scanner.nextBigDecimal();
            BigDecimal c = scanner.nextBigDecimal();
            if(a.add(b).compareTo(c) > 0 && a.add(c).compareTo(b) > 0 && c.add(b).compareTo(a) > 0){
                System.out.println("Yes");
            }else {
                System.out.println("No");
            }
        }
    }
}
